Blutooth module slave and master rc car

Projects General Guidance
1

Hey there.
I'm Chrisbisi, and I'm working on an RC car using hc05 Bluetooth modules.
I'm having sum problems with the code slash working.

I copied some code from the internet (GitHub - embeddedlab786/Bluetooth_Modules_as_Master_and_Slave: Bluetooth_Modules_as_Master_and_Slave)
and it worked.
However, when I just added a few inputs/outputs it did not work.
This is the code I made/modified.

transmitter

#include <SoftwareSerial.h>
SoftwareSerial mySerial(8, 9); // RX, TX
 


#define button A0
#define button2 A1
#define button3 A2
#define button4 A3


int buttonState;
int buttonState2;
int buttonState3;
int buttonState4;

void setup() { // put your setup code here, to run once
 pinMode(button, INPUT_PULLUP);
 pinMode(button2, INPUT_PULLUP);
pinMode(button3, INPUT_PULLUP);
pinMode(button4, INPUT_PULLUP);

 Serial.begin(9600); // Begin serial communication with Arduino and Arduino IDE (Serial Monitor) 
 mySerial.begin(9600); // Default communication rate of the Bluetooth module

}

void loop() { 
 // Reading the button
 buttonState = digitalRead(button);
 buttonState2 = digitalRead(button2);
 buttonState3 = digitalRead(button3);
 buttonState4 = digitalRead(button4);

 if (buttonState == LOW) { //send  data to slave
  mySerial.write('1'); 
 }
 else if (buttonstate2 = LOW)
 {
   mySerial.write('2');
 }  
 else if (buttonstate3 = LOW)
 {
   mySerial.write('3');
 } 
 else if (buttonstate4 = LOW)
 {
   mySerial.write('4');
 }
 else
 {
   mySerial.write('0');
 }  

}

receiver

#include <SoftwareSerial.h>
SoftwareSerial mySerial(8, 9); // RX, TX


#define rightfront 2
#define rightback 3
#define leftfront 4
#define leftback 5

int state = 0;


void setup() { // put your setup code here, to run once
 
 pinMode(rightfront, OUTPUT);
 pinMode(rightback, OUTPUT);
 pinMode(leftfront, OUTPUT);
 pinMode(leftback, OUTPUT);

 Serial.begin(9600); //Begin serial communication with Arduino and Arduino IDE (Serial Monitor) 
 mySerial.begin(9600); // Default communication rate of the Bluetooth module
 
}

void loop() {
 if(mySerial.available() > 0){ // Checks whether data is comming from the serial port
    state = mySerial.read(); // Reads the data from the serial port
 }
 // Controlling the motors
 if (state == '1') {
  digitalWrite(rightfront, HIGH);
  digitalWrite(rightback, LOW);
  digitalWrite(leftfront, HIGH);
  digitalWrite(leftback, LOW); 
 }
 else if (state == '2') {
  digitalWrite(rightfront, LOW);
  digitalWrite(rightback, HIGH);
  digitalWrite(leftfront, LOW);
  digitalWrite(leftback, HIGH);
 }
 else if (state == '3') {
  digitalWrite(rightfront, LOW);
  digitalWrite(rightback, HIGH);
  digitalWrite(leftfront, HIGH);
  digitalWrite(leftback, LOW);  
 }
  else if (state == '4') {
  digitalWrite(rightfront, HIGH);
  digitalWrite(rightback, LOW);
  digitalWrite(leftfront, LOW);
  digitalWrite(leftback, HIGH);
 }
 else
 {
   Serial.println("0 or unidentified");
 }
 

 
}

I tried many different tutorials but only this one worked.
And when I modified it for my purpose it didn't work.
Could u pls compare the two code and try to rectify/find the problem for me?

2

That is one of the most disliked phrases on the forum. It conveys no information that we can use to help you.

What do you see in serial monitor of the receiver if you serial print what is coming in to the receiver.